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This Sept. 8, 2012 photo shows dead fish along the Salton Sea shoreline in Southern California. The South Coast Air Quality Management District posted an update in which it acknowledged the possibility that dead fish at the Salton Sea are the source of the rotten-egg smell reported all day Monday. The update noted, however, that "it is highly unusual for odors to remain strong up to 150 miles from their source." (AP Photo/Nick Ut)

This Sept. 8, 2012 photo shows dead fish along the Salton Sea shoreline in Southern California. The South Coast Air Quality Management District posted an update in which it acknowledged the possibility that dead fish at the Salton Sea are the source of the rotten-egg smell reported all day Monday. The update noted, however, that "it is highly unusual for odors to remain strong up to 150 miles from their source." (AP Photo/Nick Ut)